A process with "Six Sigma" capability means having 12 standard
deviations of process output between the upper & lower
specification limits. Essentially, process variation is reduced so that
no more than 3.4 parts per million fall outside of the specifications
limits. The higher the sigma number, the better.
The "Six Sigma" term also refers to a philosophy, goal and/or
methodology utilized to drive out waste and improve the quality, cost
and time performance of any business. Six Sigma implementation is
achieved through a series of successful projects. Process improvements
and variation reduction are achieved through application of Six Sigma
improvement projects, which in turn, are executed following either the
DMAIC (Define, Measure, Analyze, Improve, Control) or DMADV (Define,
Measure, Analyze, Design, Verify) methodologies. Black Belts &
Green Belts are the key players in execution of Six Sigma improvement
projects.
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